Use default copy constructors and assignment operators for QgsDistanceArea

There's no complex member variables here - the default implementations
should be fine (actually faster, since they won't require
recalculation of the derived parameters)

python/core/qgsdistancearea.sip

@@ -32,13 +32,6 @@ General purpose distance and area calculator.
 Constructor
 %End
 
-    QgsDistanceArea( const QgsDistanceArea &origDA );
-%Docstring
-Copy constructor
-%End
-
-//     QgsDistanceArea &operator=( const QgsDistanceArea &origDA );
-
     void setEllipsoidalMode( bool flag );
 %Docstring
  Sets whether coordinates must be projected to ellipsoid before measuring

src/core/qgsdistancearea.cpp

@@ -55,40 +55,6 @@ QgsDistanceArea::QgsDistanceArea()
   setEllipsoid( GEO_NONE );
 }
 
-
-QgsDistanceArea::QgsDistanceArea( const QgsDistanceArea &origDA )
-{
-  _copy( origDA );
-}
-
-QgsDistanceArea &QgsDistanceArea::operator=( const QgsDistanceArea &origDA )
-{
-  if ( this == & origDA )
-  {
-    // Do not copy unto self
-    return *this;
-  }
-  _copy( origDA );
-  return *this;
-}
-
-//! Copy helper. Avoid Sqlite3 accesses.
-void QgsDistanceArea::_copy( const QgsDistanceArea &origDA )
-{
-  mEllipsoidalMode = origDA.mEllipsoidalMode;
-  mEllipsoid = origDA.mEllipsoid;
-  mSemiMajor = origDA.mSemiMajor;
-  mSemiMinor = origDA.mSemiMinor;
-  mInvFlattening = origDA.mInvFlattening;
-  if ( ( mSemiMajor > 0 ) && ( mSemiMinor > 0 ) )
-  {
-    // Some calculations and trig. Should not be TOO time consuming.
-    // Alternatively we could copy the temp vars?
-    computeAreaInit();
-  }
-  mCoordTransform = origDA.mCoordTransform;
-}
-
 void QgsDistanceArea::setEllipsoidalMode( bool flag )
 {
   mEllipsoidalMode = flag;

src/core/qgsdistancearea.h

@@ -42,12 +42,6 @@ class CORE_EXPORT QgsDistanceArea
     //! Constructor
     QgsDistanceArea();
 
-    //! Copy constructor
-    QgsDistanceArea( const QgsDistanceArea &origDA );
-
-    //! Assignment operator
-    QgsDistanceArea &operator=( const QgsDistanceArea &origDA );
-
     /** Sets whether coordinates must be projected to ellipsoid before measuring
      * \note for calculations to use the ellipsoid, both the ellipsoid mode must be true
      * and an ellipse must be set
@@ -340,9 +334,6 @@ class CORE_EXPORT QgsDistanceArea
       Length
     };
 
-    //! Copy helper
-    void _copy( const QgsDistanceArea &origDA );
-
     //! used for transforming coordinates from source CRS to ellipsoid's coordinates
     QgsCoordinateTransform mCoordTransform;